MA Clementino, GLA Ribeiro, NCM Gomes and Firmino RT participated in the literature review, methodology, analysis and discussion of the data and drafting the article; MBLD
Smith participated in the analysis and discussion of data, drafting and correction of the article; AF Granville-Garcia devised directed and coordinated the study, participated in the analysis and discussion of data, drafting and correcting the article.
(13.) Cardoso DDP, Soares CMA, Souza MBLD
, Azevedo MSP, Martins RMB, Queiroz DAO, et al.
(3) "we took our historic decision last December  to return to fixed prices for our export crudes and to reduce total OPEC production to 15.8 million barrels a day (mbld
) for the first six months of this year."